CF44A.Indian Summer

普及/提高-

通过率：0%

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题目描述

Indian summer is such a beautiful time of the year! A girl named Alyona is walking in the forest and picking a bouquet from fallen leaves. Alyona is very choosy — she doesn't take a leaf if it matches the color and the species of the tree of one of the leaves she already has. Find out how many leaves Alyona has picked.

输入格式

The first line contains an integer $n$ ( $1<=n<=100$ ) — the number of leaves Alyona has found. The next $n$ lines contain the leaves' descriptions. Each leaf is characterized by the species of the tree it has fallen from and by the color. The species of the trees and colors are given in names, consisting of no more than $10$ lowercase Latin letters. A name can not be an empty string. The species of a tree and the color are given in each line separated by a space.

输出格式

Output the single number — the number of Alyona's leaves.

输入输出样例

输入#1

5
birch yellow
maple red
birch yellow
maple yellow
maple green

输出#1

输入#2
```
3
oak yellow
oak yellow
oak yellow
```
输出#2
```
1
```

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